Data Sheet. AEAT-7000 Series Ultra-precision 13-Bit Gray Code Absolute Encoder Module. Description. Features. Applications
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1 AEAT-7000 Series Ultra-precision 13-Bit Gray Code Absolute Encoder Module Data Sheet Description Avago Technologies AEAT-7000 Series is a high temperature rated optical encoder module that is capable of providing up to 13 bits of absolute positioning information. The photodetector ASIC and the light emitter are designed into a compact C-shape module. It s small, compact and modular form factor also makes it an ideal choice for space-constrained applications. AEAT-7000 uses a sophisticated photodetector ASIC that consists of an array of photodiodes, precision amplifiers, and additional signal processing circuitry. This photodetector ASIC includes two pairs of analog photodiodes to generate 2 channels of true differential Sine and Cosine signals. For a closed loop emitter light monitoring, the ASIC will monitor internally and self regulate if the infrared (IR) LED degrades. The Sin/Cosine photodiodes are used to drive a constant current source for the highly collimated IR illumination system. Note: Avago Technologies encoders are not recommended for use in safety critical applications, e.g., ABS braking systems, power steering, life support systems and critical care medical equipment. Avago s products and software are not specifically designed, manufactured or authorized for sale as parts, components or assemblies for the planning, construction, maintenance or direct operation of a nuclear facility or for use in medical devices or applications. Customer is solely responsible, and waives all rights to make claims against Avago or its suppliers, for all loss, damage, expense or liability in connection with such use. Please contact sales representative if more clarification is needed. Features 11 digital tracks plus 2 Sin/Cosine tracks generate precise 13-bit gray code Ultra fast, 1us cycle for serial data output word equals 16MHz Integrated highly collimated illumination system On-chip interpolation and code correction compensate for mounting tolerance 2 channels true differential Sine/Cosine outputs with 1024 cycles per revolution 1024CPR A/B channel incremental outputs MSB can be inverted for changing the counting direction Built-in monitor track for monitoring of LED light level Error output for LED degradation monitoring -40 to 85 C operating temperature Applications Typical applications include Rotary applications up to 13 bits/360 absolute position Industrial and maritime valve control High precision test and measurement machines Industrial and factory automation equipments Textile, woodworking & packaging machineries Nacelle & blades control in wind turbine ESD WARNING: Handling precautions should be taken to avoid static discharge.
2 Absolute Maximum Ratings 1 Parameter Symbol Min. Max. Units Storage Temperature T S C Operating Temperature T A C Supply Voltage V DD V Voltages at all input and output pins Vin & Vout -0.3 V DD +0.3 V DC supply voltage VD V Relative Air Humidity (non-condensing) 2 T/RH 40 / 93 C/% Note: 1. Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables Recommended Operating Conditions and Characteristics provide conditions for actual device operation. 2. Maximum combination of temperature on humidity Recommended Operating Conditions Description Symbol Min. Typical Max. Units Notes Temperature T A C Supply Voltage V DD V Ripple < 500 mvpp Input-H-Level Threshold V ih 2.0 V DD V Input-H-Level threshold Input-L-Level Threshold V il V Input-L-Level threshold Electrical Characteristics Table(V DD = 4.5 to 5.5V, TA = -40 to +85 C) Electrical characteristics over recommended operating conditions. Typical values at 25 C Parameters Symbol Conditions Min. Typ. Max. units Operating Currents Total Current I Total LED typ 52 ma Digital Inputs Pull down Current I pd μa Pull Up Current I pu μa Digital Outputs Ouput-H-Level V oh I oh = 2 ma V DD - 0.5V V DD V Output-L-Level V ol I ol = -2mA V Serial Interface SCL Clock Frequency f clock 16 MHz Duty Cycle fclock T clock,lh f clock = 10MHz Accuracy within one revolution Notes 1, 2,3 f SCL = 5MHz RPM = 100prm V ripple = <50mVpp +/-1 bits Notes: 1. LSB accuracy will also depend on mechanical precision of the shaft, bearing, hub etc, Final accuracy of the encoder module is dependent on the precision of the total assembly. 2. Accuracy would be influenced by installation control and the bearing and shaft type being used. 3. Other test conditions to determine accuracy are briefly listed as follows: (a) At nominal radial, tangential and gap position (b) On dual preloaded bearing with absolute assembly total runout of not exceeding 0.01mm TIR 2
3 Functional Description Background The 13 signal channels are set up as: Two precision defining Signal (A0, A09), which are 90 electrical shifted sine, cosine signals. These are conditioned to be compensated for offset and gain errors. After conditioning they are on chip interpolated of 4bits. 11 analog (A1 A11) channels which are directly digitized by precision comparators with hysteresis tracking. The digitized signals are called D1-D11. Internal correction and synchronization module allows the composition of a true 1bit Gray code by merging the data bits of A1-A11 and Sin/Cosine. There is a Gray code correction feature for this encoder. This Gray code correction can be disabled/ enabled by the pin KORR. The gain and offset conditioning value of the sine and cosine signals are preloaded on-chip by factory this will compensate for mechanical sensor misalignment error. Signal channels A1-A11 The photocurrent of the photo diodes is fed into a trans-impedance amplifier. The analog output of the amplifier has a voltage swing of (dark/light) about 1.3V. Every output is transformed by precision comparators into digital signals (D1-D11). The threshold is at VDD/2 (=Analog-reference), regulated by the sin/cosine channel. Monitor channel with LED control at Pin LEDR and LERR The analog output signal of the monitor channel is regulated by the LED current. An internal bipolar transistor sets this level to VDD/2 (control voltage at pin (LEDR). Thus the signal swing of each output is symmetrical to VDD/2 (=Analog-reference) The error bit at pin LERR is triggered if the Ve of the internal bipolar transistor is larger than VDD/2. Signal channel A0, A09 with signal conditioning and calibration These two channels give out a sine and cosine wave, which are 90 degree phase shifted. These signals have amplitudes which are almost constant due to the LED current monitoring. Due to amplifier mismatch and mechanical misalignment, the signals have gain and offset errors. These errors are eliminated by an adaptive signal conditioning circuitry. The conditioning value are on-chip preprogrammed by factory. The analog output signals of A0 and A09 are supplied as true-differential voltage with a peak-to-peak value of 1.0V at the pins A09P, A09N, A0P, A0N. Interpolator for channels A0, A09 A0 channel will digitize to form D0 and the LSB bit (D-1) will generate from the interpolator. The D0 to D-1will be synchronize with the 11-bit data to D12 D0 to form a 13bit absolute position. The channels A0, A09 and A1~A11 have very high dynamic bandwidth, which allows a real time monotone 12-bit Gray code at 12000RPM. LSB gray code correction (Pin KORR) This function block synchronizes the switching points for the 11-bit Gray code of the digital signals D1 to D11 with D0 and D09 (digitized signal of A0 and A09). This Gray code correction only works for the 12-bit MSB(4096 step per revolution). The correction is not for the interpolated bits Gray code correction can be switched on or off by putting the pin KORR = 1 (on) or = 0 (off). MSBINV and DOUT Pins The serial interface consists a shift register. The most significant bit, MSB (D11) will always be sent first to DOUT. The MSB can be inverted (change code direction) by using pin MSBINV. Setting MSBINV to high state, output data will be counting in another direction. From top view, if code wheel turning clock wise output data will be increment up, if MSBINV set to high state, output data will be counting another direction. If code wheel turning counter-clock wise the output data will be decrement, if the MSBINV set to high state, output data will be counting up. DIN and NSL Pins The serial input DIN allows the configuration as ring register for multiple transmissions or for cascading 2 or more encoders. DIN is the input of the shift register that shifts the data to DOUT. The NSL pin controls the shift register, to switch it between load (1) or shift (0) mode. Under load mode, DOUT will give the logic of the MSB, i.e., D11. Under shift mode (0), coupled with the SCL, the register will be clocked, and gives out the serial word output bit by bit. As the clock frequency can be up to 16MHz, the transmission of the full 13-bit word can be done within 1us. Valid data of DOUT should be read when the SCL clock is low. Please refer to timing diagram (Figure 1). 3
4 Figure 1. SSI Timing diagram Pin out Descriptions Figure 2. Top view of the encoder readhead No. Pin Name Description Function Notes 1 LEDK Internally connected to LED Do not use 2 KORR Digital input 1 = Gray Code Correction Active CMOS,internal pu 3 SPI_CLK Digital input SPI clock input CMOS, internal pd 4 SPI_SO Digital output SPI data output CMOS 5 SPI_SI Digital input SPI data input CMOS, internal pu 6 MSBINV Digital Input Inverted counting if set to high state CMOS, internal pu 7 DIN Digital Input Shift register input (for cascading use) CMOS, internal pu 8 NSL Digital Input Enable shift-register clock (for 3wire SSI)Note1 CMOS, internal pu 9 SCL Digital Input Shift-register Clock CMOS, internal pu Positive Edge 10 DOUT Digital Output Shift-Register Data Out(MSB first) CMOS 11 INCB Digital Output Incremental output B channel CMOS 12 INCA Digital output Incremental output A channel CMOS 13 VDD Supply Voltage +5V Supply 14 GND Ground for supply Ground voltage 15 COSINE+ Analog output Diff Cosine+ analog output CMOS, analog out 16 GND Ground for supply Ground voltage 17 SINE+ Analog Output Diff SINE+ analog output CMOS, analog out 18 COSINE- Analog Output Diff Cosine- analog output CMOS, analog out 19 VDD Supply Voltage +5V Supply 20 SINE- Analog Output Diff SINE- analog output CMOS, analog out 21 LERR Digital Output ERROR pin, error(=1)/no error(=0) CMOS 22 SPI_EN Digital input SPI data input CMOS 4
5 Mechanical Dimensions p header pin 2X Ø X M1.6 tap dp radial +tangential C L Ø Ø Ø ± ± 0.05 (CODEDISC) (RETICLE) +Z Z
6 Code Wheel Dimensions Ø 42.0 ±0.1 2X M3X3 SET SCREW Ø 15.0 ± ± ± ± TYPICAL Ø POSITION 0 REFERENCE MARKER Notes: 1. All dimensions are in millimeter. 2. Tolerance: X.XX ± 0.10mm. 3. Shim thickness for Z height setting = 300μm +/- 10% 4. Code disk and readhead mounting tolerances for radial, tangential and gap are as below Radial : +/-50μm Tangential : +/-40μm Ordering Information AEAT S 0 D-13 bits G = Gray code For product information and a complete list of distributors, please go to our web site: Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright Avago Technologies. All rights reserved. AV EN - July 19, 2010
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